| 51. | harness a river, a waterfall, the sun's rays as a source of energy |
| 利用河水, 瀑布, 太阳光作为能源
|
| 52. | an unfailing source of inspiration |
| 用之不竭的灵感的源泉
|
| 53. | evidence from an unimpeachable source |
| 来源可靠的证据
|
| 54. | an untapped source of wealth, talent, inspiration |
| 未利用的财源, 聪明才智, 灵感
|
| 55. | utilize solar power as a source of energy |
| 利用太阳能作为能源
|
| 56. | news from a reliable source |
| 来源可靠的消息
|
| 57. | a limited source of income |
| 有限的收入来源
|
| 58. | a reliable source of supply |
| 可靠的来源
|
| 59. | a source of multitudinous [untold] evils |
| 万恶之源
|
| 60. | strike the evil at its source |
| 根除罪恶
|